One vertex per element, one color per generator, with an edge from x to x·s.
(2,5)(6,8)(9,10)(11,12)(13,15)(14,16)(17,18,21,19)(20,23,24,22)(26,30)(27,33)(28,35)(38,40)(1,2,4,5)(3,6,7,8)(9,11,14,15)(10,13,16,12)(27,33)(31,36)(34,39)(38,40)(3,7)(6,8)(9,12,14,13)(10,11,16,15)(17,19,21,18)(20,23,24,22)(25,26)(27,31)(28,32)(29,30)(33,36)(34,38)(35,37)(39,40)(1,2)(3,8)(4,5)(6,7)(9,13,14,12)(10,15,16,11)(17,20,21,24)(18,22,19,23)(25,27)(26,31)(28,34)(29,33)(30,36)(32,38)(35,39)(37,40)(1,3)(2,6)(4,7)(5,8)(9,10)(11,13)(12,15)(14,16)(25,28,29,35)(26,32,30,37)(27,34,33,39)(31,38,36,40)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.